?? lpcrr2ar.m
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function [ar,e]=lpcrr2ar(rr);
%LPCRR2AR convert autocorrelation coefs to ar coefs [AR,E]=(RR)
%E is the residual energy
% could test e each time and remove rows when it gets small
% Copyright (C) Mike Brookes 1997
%
% Last modified Fri Dec 3 16:10:02 1999
%
% VOICEBOX is a MATLAB toolbox for speech processing. Home page is at
% http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% This program is free software; you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation; either version 2 of the License, or
% (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You can obtain a copy of the GNU General Public License from
% ftp://prep.ai.mit.edu/pub/gnu/COPYING-2.0 or by writing to
% Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
[nf,p1]=size(rr);
p=p1-1;
ar=ones(nf,p1);
ar(:,2) = -rr(:,2)./rr(:,1);
e = rr(:,1).*(ar(:,2).^2-1);
for n = 2:p
k = (rr(:,n+1)+sum(rr(:,n:-1:2).*ar(:,2:n),2)) ./ e;
ar(:,2:n) = ar(:,2:n)+k(:,ones(1,n-1)).*ar(:,n:-1:2);
ar(:,n+1) = k;
e = e.*(1-k.^2);
end
e=-e;
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